[regexp] Experimental support for regexp named captures

src/js/regexp.js

Index: src/js/regexp.js
diff --git a/src/js/regexp.js b/src/js/regexp.js
index ef6a4aed053b3d15f23056a64c4540112be08337..a881c490006b8e961c8c8a1125952231f986e409 100644
--- a/src/js/regexp.js
+++ b/src/js/regexp.js
@@ -141,7 +141,7 @@ function DoRegExpExec(regexp, string, index) {
 // This is kind of performance sensitive, so we want to avoid unnecessary
 // type checks on inputs. But we also don't want to inline it several times
 // manually, so we use a macro :-)
-macro RETURN_NEW_RESULT_FROM_MATCH_INFO(MATCHINFO, STRING)
+macro RETURN_NEW_RESULT_FROM_MATCH_INFO(MATCHINFO, STRING, JSREGEXP)
   var numResults = NUMBER_OF_CAPTURES(MATCHINFO) >> 1;
   var start = MATCHINFO[CAPTURE0];
   var end = MATCHINFO[CAPTURE1];
@@ -160,6 +160,9 @@ macro RETURN_NEW_RESULT_FROM_MATCH_INFO(MATCHINFO, STRING)
     }
     j++;
   }
+  // For each named capture 'a', create a property result.a containing the
+  // corresponding captured string.
+  %RegExpResultAttachNamedCaptures(result, JSREGEXP);
   return result;
 endmacro
 
@@ -170,7 +173,7 @@ function RegExpExecNoTests(regexp, string, start) {
   if (matchInfo !== null) {
     // ES6 21.2.5.2.2 step 18.
     if (REGEXP_STICKY(regexp)) regexp.lastIndex = matchInfo[CAPTURE1];
-    RETURN_NEW_RESULT_FROM_MATCH_INFO(matchInfo, string);
+    RETURN_NEW_RESULT_FROM_MATCH_INFO(matchInfo, string, regexp);
   }
   regexp.lastIndex = 0;
   return null;
@@ -219,7 +222,7 @@ function RegExpSubclassExecJS(string) {
   if (updateLastIndex) {
     this.lastIndex = RegExpLastMatchInfo[CAPTURE1];
   }
-  RETURN_NEW_RESULT_FROM_MATCH_INFO(matchIndices, string);
+  RETURN_NEW_RESULT_FROM_MATCH_INFO(matchIndices, string, this);
 }
 %FunctionRemovePrototype(RegExpSubclassExecJS);
 
@@ -260,7 +263,7 @@ function RegExpExecJS(string) {
   if (updateLastIndex) {
     this.lastIndex = RegExpLastMatchInfo[CAPTURE1];
   }
-  RETURN_NEW_RESULT_FROM_MATCH_INFO(matchIndices, string);
+  RETURN_NEW_RESULT_FROM_MATCH_INFO(matchIndices, string, this);
 }
 
 
@@ -1214,7 +1217,7 @@ var InternalRegExpMatchInfo = new InternalPackedArray(2, "", UNDEFINED, 0, 0);
 function InternalRegExpMatch(regexp, subject) {
   var matchInfo = %_RegExpExec(regexp, subject, 0, InternalRegExpMatchInfo);
   if (!IS_NULL(matchInfo)) {
-    RETURN_NEW_RESULT_FROM_MATCH_INFO(matchInfo, subject);
+    RETURN_NEW_RESULT_FROM_MATCH_INFO(matchInfo, subject, regexp);
   }
   return null;
 }